Self-regulating damper



` C. Hl LAVIS. Self Regulating Damper. y NQ 43,291.5`PatentedJune2O,11865.

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UNITED STATES PATENT OFFICE.-

CHAS. H. LAVIS, OF PHILADELPHIA, PENNSYLVANIA.

SELF-REGULA'IV'ING DAM PER.

Specification forming part of Letters Patent No. 48,291, dated June 20,12565; antedated March 15, 1865.

To all whom it may concern:

Be it known that I, CHARLES H. LAVIS, of Philadelphia, in the county ofPhiladelphia, in

the State of Pennsylvania, have invented a new and ImprovedSelf-Regulating Damper for stoves, furnaces, smelting-furnaces,and thelike, which require a well-regulated draft; and

' I do hereby declare that the following is a full,

cle'ar, andexact description thereof', reference being had to theaccompanying drawings, and to the letters of reference marked thereon.

My invention consistsin regulating the damp-A out the several Views.

A is a square drum, (ofany metal,) in which the damper B, which vibrateswith the rod C, is fitted. The rod C passes through the drum A and bearson its sides at c c. It is placed as near the upper corner or angle, d,as may be convenient for its proper working. One end D ofuthe rod C isbent to any angle (in this case to a right angle.) This end D has ascrew cut on it, on which is screwed the balance E.

Circular holes F F are out on opposite sides of the drum A, sothat theworking ofthe damper B may be seen. These holes are covered withisinglass, which is kept in place by the flaps e c.

Small holes ffffare punched in the damper B, to allow the gasto escapewhile the damper is closed.

The flanges Gr G are to receive the stovepipe to which the drum A isfitted.

The damper B, hoes c c', end D of the rod C, and balance E form a leverof the first order. rPhe holes c c are the fulcrums, the damper B theweight, and the balance E the power. The weight E can be so adjustedthat a perfect equilibrium will exist and the dam'per B be entirelyclosed. It can also be adj usted by screwing the weight up or down thatany degree of draft can be obtained. l i

What I claim as of my invention, and desire to secure by Letters Patent,is

Y The drum A, the damper B, the rod C, the

Y screw D, and the balance E, constructed and operated with reference toeach other, and for Vthe purpose and in the manner as herein shown anddescribed.

CHARLES H. LAVIS.

Witnesses: i

W. W. DOUGHEE'LY, AMos J. KELLY.

